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Digital technology that sounds perfect

Alpine's X-Power MRX-F65 4-channel amplifier uses the latest in amp technology to play your music loud and clean without taking up much space. And this compact amp employs some of the same circuitry developed for Alpine's top-of-the-line PDX digital amps so it'll bring exceptional sound to your ride.

Massive power for high-level systems

The MRX-F65 puts out 110 watts RMS per channel, so you'll have plenty of clean power to fill your listening space with music. You can even use it in 2-channel mode to drive a pair of subs with 320 watts each. Onboard frequency filters let you tailor the output to fit your setup, and a bass boost on the rear channels helps to fatten up the sound.

Looks cool too

A power management system optimizes the amp's performance and keeps the music playing, even when you're pushing it hot and hard for a long time. Speaker-level inputs with an automatic turn-on feature simplify system hook-up.

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Product Research

Features

MRX Amplifier Design: Class-D amplifiers boast higher
efficiency, produce less heat, and draw less current than traditional
Class-AB amps. The MRX series benefits from the technology trickledown
from Alpine's more expensive PDX amps, including Direct FET final outputs,
thermal management processor, 6-Layer Glass Epoxy PC Board; combining to create
a high-end sound quality without the bulky heat sinks required by most amps in
this power class.

Power Management Processor: The multi-stage Power Management
Processor continuously monitors component temperatures throughout the amplifier
and decreases power output if anything gets too hot. When playing music under heavy
loads for long periods, the circuit automatically reduces power output slightly
at first, and then further in a second stage if necessary. This two stage approach
provides an interruption free listening experience.

CEA 2006 Compliant: The MRX-F65's power ratings are measured
according to the Consumer Electronics Association CEA-2006 standards. These standards
allow you to accurately compare the rated power output of all CEA 2006-compliant
amplifiers, even different brands. Manufacturers who adhere to the standards can
display the CEA 2006 logo on their products and packaging. The power output is
measured from 20 Hz to 20 kHz using a 14.4 volt power supply with no more than
0.01% THD+N:

4-ohms: 110 watts RMS x 4

2-ohms: 160 watts RMS x 4

4-ohm bridged: 320 watts RMS x 2

Signal-to-Noise: When measured under CEA-2006 conditions
(reference 1 watt into a 4-ohm load) the signal to noise ratio is 87 dBA.
Measured at the rated power output S/N is 106 dB.

Verification Certificate: The amplifier comes with a certificate
that lists the RMS power output measured from that specific amplifier. It also lists
the model number, serial number, test date, and the test conditions (voltage and
impedance).

Auto Turn On: When using the speaker level inputs the X-Power
amplifiers automatically turn on when voltage is detected on the signal inputs,
making them an easy factory system upgrade.

LED: The top panel LED power indicator glows blue when the
amplifier is turned on.

Controls

Gain: The MRX-F65's gain can be independently set for the
front and rear channels. The line-level input gain setting is
continuously variable from 200 mV to 4.0V; the speaker-level input gain setting
is continuously variable from 500 mV to 10.0V.

Crossovers: The amplifier has independent built-in
crossovers for the front and rear channels. They can be set to low-pass or
high-pass operation, or off via a three-way switch. The crossover frequency is continuously
variable from 50 to 400 Hz and the slope is 12 dB/oct.

Bass EQ: Bass boost for the rear channels is variable from 0 to +12 dB and centered at 50 Hz.

Connections

Power/Ground/Remote: The MRX-F65 features set-screw terminals
for the Power, Ground and Remote Turn-on inputs. The Power and Ground terminals
will accommodate up to 4 gauge wire, while the Remote
Turn-on terminal will accept up to 8 gauge wire. Based on the fuse rating and
power output, 4 gauge power and ground wires are recommended.

Speaker Output: The speaker output terminals are screw
terminals which will accept up to 8 gauge wire.

Line Inputs: Line level RCA is the preferred input
connection. There are two pairs of RCA line-level inputs. No line output is
provided.

Speaker Level Input: Use the included speaker level input
harnesses if the connected radio has no preamp outputs.

Fuses: The amp is protected by two chassis-mounted 30-amp ATO fuses.

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Sonic joy!

It's an Alpine - what else can I say? Install is in a 2006 Jeep Liberty Limited (formerly with the OEM Infinity HU and speakers). New HU = Kenwood KVT-516 (from Crutchfield), front speakers = Infinity Kappa 60.11cs (2 ohm) and rear speakers = Kicker Compvt65 (2 ohm) compact subwoofers. This was the final piece to the slow upgrade of the OEM system over the last 2 years as various speakers began to fail. Now I understand the true meaning of "power". The system has come alive! With the 2 ohm speakers I am more than likely at about 180w (RMS). Still dialing in the final adjustments and EQ. Amp fit under rear seat on driver side (slide in sideways, turn, fits perfectly - only needed to Velcro - no side-to-side movement or front-to-back). Exactly what I needed to take this system to the next level. It's like having a new car. Bought the Amp from scratch and dent to save some $$ - did not disappoint - sealed box with all parts and install manual - same warranty. Stellar.

Good Amplifier for 110 Watt RMS Alpine Speakers

Okayyyy, so check this out. I just got this amplifier installed today. Well, I started freaking out because as I increased the gain on my radio, everything was all jacked up and distorted. Little did I know, you have to mess around with the "Gain" settings on the amplifier after installation until the distortion goes away. Then, you got yourself a beautiful amp.

Great amp for 2006 Ford Freestar

Written By DavidF, MD on Thursday, March 21, 2013

Very happy with this amp.

Fit it under front passenger seat (manual). I made a mounting plate from some scrap I had laying around, bolted the plate to the seat's central frame bar at floor where seat electrical plugs mount. Just unsnapped the plugs from the bar and left them loose above the amp so they can move as seat is adjusted. Grounded to base of virtical pillar between front/side doors. Used 4AWG power kit: StreetWires ZeroNoise 5 ZN5K-04, heavy speaker wires: StreetWires UCT14, and line-level cables: StreetWires Zero Noise 5 Stereo Patch Cables 4-channel (11.5'). Turned sideways, heat sink/case is pretty safe/rugged in case back-seat feet, etc. get on it.